(x – 280): 35 =55:5
Tìm số tự nhiên χ:
a) (χ - 15) x 7 - 270 : 45 = 169
b) [( 4χ + 28) x3 + 55] : 5 = 35
c) (455 x χ : 2 x 6) : 5 = 31
d) 128 x χ - 12 x χ - 16 x χ = 520 800
e) (χ x 0,25 + 2022) x 2023 = (50 + 2022) x 2023
f) 4 x χ + 100 = χ + 280
g) (χ + 1) + (χ + 2) + (χ + 3) + .... + (χ + 100) = 7450
Em xin cách giải mấy câu trên ạ, em xin cảm ơn nhiều ạTT
a) (x - 15) × 7 - 270 : 45 = 169
(x - 15) × 7 - 6 = 169
(x - 15) × 7 = 169 + 6
(x - 15) × 7 = 175
x - 15 = 175 : 7
x - 15 = 25
x = 25 + 15
x = 40
b) [(4x + 28) × 3 + 55] : 5 = 35
(4x + 28) × 3 + 55 = 35 × 5
(4x + 28) × 3 + 55 = 175
(4x + 28) × 3 = 175 - 55
(4x + 28) × 3 = 120
4x + 28 = 120 : 3
4x + 28 = 40
4x = 40 - 28
4x = 12
x = 12 : 4
x = 3
c) (455 × x : 2 × 6) : 5 = 31
455 × x : 2 × 6 = 31 × 5
455 × x : 2 × 6 = 155
x × 455 : 2 × 6 = 155
x × 1365 = 155
x = 155 : 1365
x = 31/273
d) 128 × x - 12 × x - 16 × x = 520800
(128 - 12 - 16) × x = 520800
100 × x = 520800
x = 520800 : 100
x = 5208
e) (x × 0,25 + 2022) × 2023 = (50 + 2022) × 2023
(x × 0,25 + 2022) × 2023 = 2072 × 2023
(x × 0,25 + 2022) × 2023 = 4191656
x × 0,25 + 2022 = 4191656 : 2023
x × 0,25 + 2022 = 2072
x × 0,25 = 2072 - 2022
x × 0,25 = 50
x = 50 : 0,25
x = 200
f) 4 × x + 100 = x + 280
4 × x - x = 280 - 100
(4 - 1) × x = 180
3 × x = 180
x = 180 : 3
x = 60
g) (x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 7450
x + 1 + x + 2 + x + 3 + ... + x + 100 = 7450
100 × x + 100 × 101 : 2 = 7450
100 × x + 5050 = 7450
100 × x = 7450 - 5050
100 × x = 2400
x = 2400 : 100
x = 24
Tìm x, biết:
a) x - 280: 35 - 5.54;
b) ( x - 120) : 35 = 5;
c) (x + 100). 4 = 800;
d) x . 5 + 10.9 = 990
a) x = 278.
b) x = 295.
c) x = 100.
d) x = 180.
Tìm x, biết:
a) x - 280: 35 - 5.54;
b) ( x - 120) : 35 = 5
c) (x + 100). 4 = 800;
d) x . 5 + 10.9 = 990
a) x = 278.
b) x = 295.
c) x = 100.
d) x = 180
Tìm x biết:
a) x - 280 : 35 = 5.54
b) (x - 280) : 35 = 56 : 5
c) x : 15 + 42 = 13 + 25.8
d) (x - 128 + 20) : 192 = 0
e) 460 + 85.4 = (x + 200).4
f) x + 5.2 - ( 32 + 16.3 : 16 - 15) = 0
GIÚP MÌNH NHA!
x - 280 : 35 = 5 . 54
x - 280 : 35 = 5 . 54
x - 280 : 35 = 270
x - 280 = 270 x 35
x - 28 = 9450
x = 9450 + 280
x = 9730
cho mk nhe
x - 280 : 35 = 5 . 54
x - 280 : 35 = 270
x - 280 = 270 . 35
x - 280 = 9450
x = 9450 + 280
x = 9730
Vậy x = 9730
Nhớ k nha mik lm đúng rồi!
Ta có: \(x-280:35=5.54\)
\(\Rightarrow x-8=270\)
\(\Rightarrow x=270+8\)
\(\Rightarrow x=278\)
Vậy x = 278
nha m.n
(x-280) :35 =56 :5
( x-280) :35=56:5
a)x-280:35=5.54 b)(x-280):35=10 c)2448:[119-(x-6)]=24
(x-280):35=56:5
(giải chi tiết)
(x-280):35= 56:5=56/5
x-280=56/5.35=392
x=392+280=672
( x - 280 ) : 35 = 56 : 5
( x - 280 ) : 35 = 11.2
x - 280 = 11.2 x 35
x - 280 = 392
x = 392 + 280
x = 672
\(\left(x-280\right):35=56:5\)
\(\left(x-280\right):35=\frac{56}{5}\)
\(x-280=\frac{56}{5}\cdot35\)
\(x-280=392\)
\(x=392+280\)
\(x=672\)
Dấu chấm có nghĩa là dấu nhân nha bạn
Chúc bạn học tốt !!!